fix: add FK constraint to attachments.dm_message_id via table rebuild

Rebuilds the attachments table with ON DELETE CASCADE on dm_message_id.
Dangling records are excluded during copy — their files become standard
disk orphans detectable by the storage janitor. Also updates the raw SQL
in index.ts to include width/height/duration columns for fresh installs.

packages/server/src/db/index.ts

@@ -89,19 +89,6 @@ function createTables(db: Database.Database): void {
       created_at INTEGER NOT NULL
     );
 
-    CREATE TABLE IF NOT EXISTS attachments (
-      id TEXT PRIMARY KEY,
-      message_id TEXT REFERENCES messages(id) ON DELETE CASCADE,
-      dm_message_id TEXT,
-      uploader_id TEXT,
-      filename TEXT NOT NULL,
-      original_name TEXT NOT NULL,
-      mimetype TEXT NOT NULL,
-      size INTEGER NOT NULL,
-      thumbnail_filename TEXT,
-      created_at INTEGER NOT NULL
-    );
-
     CREATE TABLE IF NOT EXISTS dm_channels (
       id TEXT PRIMARY KEY,
       owner_id TEXT,
@@ -125,6 +112,22 @@ function createTables(db: Database.Database): void {
       created_at INTEGER NOT NULL
     );
 
+    CREATE TABLE IF NOT EXISTS attachments (
+      id TEXT PRIMARY KEY,
+      message_id TEXT REFERENCES messages(id) ON DELETE CASCADE,
+      dm_message_id TEXT REFERENCES dm_messages(id) ON DELETE CASCADE,
+      uploader_id TEXT,
+      filename TEXT NOT NULL,
+      original_name TEXT NOT NULL,
+      mimetype TEXT NOT NULL,
+      size INTEGER NOT NULL,
+      thumbnail_filename TEXT,
+      width INTEGER,
+      height INTEGER,
+      duration REAL,
+      created_at INTEGER NOT NULL
+    );
+
     CREATE TABLE IF NOT EXISTS friends (
       user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
       friend_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,